Grindstone-truing device



Nov. 11, 1924- 1,515,225 A. SEPULVEDA GRINDSTCNE TRUING/DEVICE Filed Jan. 4, 1924 fication.

Patented Nov. 11, 1924.

' -AnoL'Fo-sErU'LvnnA; or "Los ANGELES, err-mama.

GRINDSTONE-TRI'TI-NG DEVICE.

"Application filed. January 4,1924. iSe'rialNo. 684,274.

This invention relates generally to a means for 'truing up grindstones, having moreparticularly reference to a device for this purpose in the form of a removable attachment 'adapted'to be clamped upon the supporting framework of the grindstone.

The invention'has for an object the provision'of a'novel grindstone truing device characterized by efiiciency of action, and provided with suitable adjustments to meet "varying conditions.-

For further comprehension of'the invention, and of the objects and advantages thereof, reference will be had to the -follow ing description and accompanying drawings, and to the appendediclaims in which the various novel features of the invention are more particularly set forth.

Fig. 1 of the drawings is a perspective view showing my improved truing attachment applied to a grindstone.

Fig. 2 is a longitudinal vertical sectional view of the attachment, this view being taken on the line 22 of Fig. 3.

Fig. 3 is a fragmentary horizontal sectional view of the attachment taken generally along the line 33 of Fig. 2.

In Fig. 1 of the drawing the reference numeral 10 indicates an ordinary rotary grindstone the supporting frame comprising the horizontal top element 11 and the legs 12. As here embodied my improved attachment comprises briefly a scraping implement adapted to engage the perimeter of the grindstone, and a frame in which said implement is slidably mounted. This frame comprises the side elements or legs 15 united at one end by the transverse member 16, the frame being thus of general U-shape, and the members thereof are of channeled cross section with the flanges of the channels turned inward as shown.

The channeled side elements 15 of this frame form guides to slidably receive and guide the ends of a transverse bar or crosshead 18 which extends between the said side elements and carries the scraping implement referred to. This scraping implement is'in the-formof a bar-l9 of rectangu lar cross section which extends-along the front face of the crosshead and has at'its upper rear edge a rearwardly ,projected flange 20 which extends backward over, and rests upon, the top of the crosshead. Formed on the top of the crosshead'is an upwardly projected lug 21, which; engages 111 an-elojn'gated aperture in theflange 20 toholdthe scraping implement inposition. On the forward side of the scraper implement aprojecting knife element 22 '-is formed to engage the grindstone.

The scraper is adaptedto be pressed-by resilient means against thegrindstone and to'this end-a. pair of rods 25-are fixed-at their forward'ends to the rearface'of the crosshead 18 and project rearwardly from the latter through suitableopenings in-the member 16, these rods passing freely through the openings in the said-member and having nuts 26 threaded ontheir rear ends which by engagement with the said member limit the forwardmovement of-the rods. Coiled around these rods 25, and hearing at their forward ends against the rear face of the crosshead 18, are expansion springs 28 which act to press the scraper against the grindstone. As indicated in Fig. 2 I may provide a yielding abutment for these springs so that the forward pressure on the scraper may be varied.

To this end a stud 30 is fixed in the member 16 midway between the ends thereof and and has threaded thereon a. nut 31 formed with an axially projecting stud 32 which freely engages a transverse bar 33. The ends of this bar are provided with screw threaded apertures into which are threaded the bushings 3 1 having openings therethrough through which the rods 25 pass freely, the springs 28 bearing on these bushings As will be apparent, when the nut 31 is rotated, the bar 33 will be caused to move transversely to itself and in consequence the abutments of both springs will be advance or withdrawn, according to the direction of rotation of the nut, while if it is desired to individually vary the spring abutments, either of the bushings 34 may be threaded backward or forward in the bar 33.

When the device is to be used it may be secured on the end of the frame member of the grindstone by a clamp or vise such as indicated in dotted lines at 36 in Fig.1, with the edge of the scraper bearing on the grindstone, which latter is then rotated in the usual manner.

While I have illustrated and described a preferred embodiment of my invention it is to be understood that I do not limit myself to the precise construction herein disclosed and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Having thus described my invention what I claim as new and desire to protect by Letters Patent of the United States is as follows:

1. A truing attachment for grindstone comprising a scraper bar, a crosshead on which said scraper bar is removably mounted, a U-frame in the legs of which the crosshead is guided, and springs bearing on said crosshead to urge the scraper against the grindstone.

2. A truing attachment for grindstone comprising a scraper bar, a crosshead on which said scraper bar is removably mounted, a U-frame in the legs of which the crosshead is guided, and springs bearing on said crosshead to urge the scraper against the grindstone, and rods fixed to the said crosshead and having the said springs coiled therearound.

3. A truing attachment for grindstone comprising a scraper bar, a crosshead on which said scraper bar is removably mounted, a U-fframe in the legs of which the cross head is guided, and springs bearing on said crosshead to urge the scraper against the grindstone, and rods fixed to the said crosshead and having the said springs coiled therearound, the rear ends of the said rods passing freely through the said U-frame and having nuts threaded thereon.

4. A truing attachment for grindstone comprising a scraper bar, a crosshead on which said scraper bar is removably mounted, a U-frame in the legs of which the crosshead is guided, and springs bearing on said crosshead to urge the scraper against the grindstone, and adjustable abutments for said springs.

5. A truing attachment for grindstone comprising a scraper bar, a crosshead on which said scraper bar is removably mounted, a U-frame in the legs of which the crosshead is guided, and springs bearing on said crosshead to urge the scraper against the grindstone, and adjustable abutments for said springs, said adjustable abutments includin bushings threaded through opposite ends of a transverse bar and against which the said springs bear, and a nut for moving said bar transversely to itself.

It testimony whereof I have aifixed my signature.

ADOLFO SEPULVEDA. 

